[Collins] exciter tuning assembly for a Collins KWM2A

[David Murman]

There is nothing wrong that I can tell with the PTO. The problem is in the
exciter tuning assembly. PTO turns smoothly.



David

-----Original Message-----
From: collins-bounces at mailman.qth.net
[mailto:collins-bounces at mailman.qth.net] On Behalf Of Dr. Gerald N. Johnson
Sent: Friday, October 22, 2010 10:52 AM
To: collins at mailman.qth.net
Subject: Re: [Collins] exciter tuning assembly for a Collins KWM2A

The PTO grease definitely will get hard. In probably only a couple decades.

That ball is pyrex, and David Knepper has a supply of them that I think 
he bought from McMaster-Carr.

73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association.

On 10/22/2010 8:06 AM, Ian wrote:
> David,
>
> My own thoughts are that before worrying about replacement parts for the
> PTO, removing the PTO from the S-Line rig and disassembly of the PTO and a
> thorough cleaning of the slug and the likely congealed grease from years
> past will make all the difference in the world.  I routinely do that to
any
> S-Line piece of equipment that I have.  Do the same for any other parts
that
> don't appear to be working as you think they should.
>
> WARNING:  Do disassembly in a pan with reasonable sides and watch
carefully
> for the "ball" at the back end of the shaft.  More than one of us have had
> the bad experience of losing that ball in a wad of congealed grease, never
> again to be seen.
>
> Yes, this takes time and perhaps patience but there are online good
> explanations with pictures if you are going to do this.  Note carefully
the
> order of any items on the shaft of the PTO or drive shaft.
>
> I suggest NOT trying to do this with the PTO connected to the rig.  Take
the
> time to make a few digital pictures and/or drawings and unsolder carefully
> and get the PTO separated just as though you were going to replace it.
>
> Doing this I've never been disappointed no matter how poorly the PTO
worked
> beforehand.
>
> Yes, any old digital counter or another calibrated receiver that covers
the
> range of the PTO frequency (look in the manual and understand how it
works)
> makes it quite easy to recalibrate things when assemblying.
>
> Ian, K6SDE
> Silicon Valley
>
>> -----Original Message-----
>> From: collins-bounces at mailman.qth.net
> [mailto:collins-bounces at mailman.qth.net] On
>> Behalf Of David Murman
>> Sent: Thursday, October 21, 2010 8:19 AM
>> To: collins at mailman.qth.net
>> Subject: [Collins] exciter tuning assembly for a Collins KWM2A
>>
>> I listed before but looking for the assembly. I feel that either the
>> bearings are worn or the shaft is worn. Anyone with these parts or can
tell
>> me where to get them would be greatly appreciated. Would like to get this
>> fine radio working.
>>
>>
>>
>> Thanks;
>> David
>> WA4ECM
>>
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